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Frank partial dislocation in Ti2AlC-MAX phase induced by matrix-Cu diffusion

Abstract : The control of complex nanostructures is one of the most promising strategy to design tailored properties materials. Composites are often good candidates, especially with complex phases. MAX phases have remarkable properties such as low density, high modulus, good metallic conductivity, self-lubrication properties and unique mechanical behaviors both at room and high temperatures. Copper is one of the most used metals essentially because of its very high electrical conductivity. However, its low strength and its low wear resistance properties result in premature failure of components, thus restricting its wide range of applications, particularly in homopolar machines and in overhead current lines for railway. One possible route for overtaking these obstacles is to introduce into a Cu matrix, layered ternary MAX phases, such as Ti2AlC. Here we report the comprehensive description of the diffusion mechanisms of Cu-matrix elements in Ti2AlC-MAX phase interlayers by means of high-resolution electron microscopy and atomic-scale simulations. In particular, we demonstrate the formation of Ti2C platelets and evidenced Frank partial dislocations that are not expected to be found in such material. These defects have an extensive impact on the properties of the composite as they can largely improve mechanical responses and molecule segregation.
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https://hal.univ-lorraine.fr/hal-03102054
Contributor : Antoine Guitton Connect in order to contact the contributor
Submitted on : Thursday, January 7, 2021 - 1:37:47 PM
Last modification on : Tuesday, October 19, 2021 - 11:46:28 AM

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  • HAL Id : hal-03102054, version 1

Citation

Wenbo Yu, Julien Guénolé, Jaafar Ghanbaja, Maxime Vallet, Antoine Guitton. Frank partial dislocation in Ti2AlC-MAX phase induced by matrix-Cu diffusion. 45th International Conference and Expo on Advanced Ceramics and Composites (ICACC2021), Feb 2021, Virtual, United States. ⟨hal-03102054⟩

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